Malicious PDF — malware analysis report

Static analysis result for SHA-256 f04bfa00a057c43a…

MALICIOUS

PDF

47.8 KB Created: 2020-08-04 02:32:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3a30032a76a8222a37816ad2d196e0e5 SHA-1: 67c3e1baa0fe393cf9553442a3dd9c33010df1fb SHA-256: f04bfa00a057c43af4fbced5006c6f15aa2b8e9606d8f2cc0cd44137d4070cc3
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector at ttraff.com. The ML classifier strongly indicated maliciousness. The document body, though heavily obfuscated, contains the target URL, suggesting a lure to external content. No scripts were extracted, but the PDF structure itself is used for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.com/pify?keyword=banting+green+list+2020+pdf
    • http://files.beverlysoll.com/uploads/1/3/0/7/130739830/juxamodoxemu-gogibogamoga-sakidemanuj.pdf
    • http://files.mary-ellenfriedland.com/uploads/1/3/0/7/130740589/6015612.pdf
    • http://files.khoohuiling-piano.com/uploads/1/3/0/8/130814043/sugizapuf-xuritudilute-ketazu-xijoj.pdf
    • https://cdn.shopify.com/s/files/1/0430/2284/4067/files/gapeduwanepojadewu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/34007074416.pdf
    • https://cdn.shopify.com/s/files/1/0432/2243/3953/files/63946061281.pdf
    • https://cdn.shopify.com/s/files/1/0433/5910/9279/files/dutelulokevo.pdf
    • https://cdn.shopify.com/s/files/1/0447/9467/5357/files/cause_effect_essay_example.pdf
    • https://cdn.shopify.com/s/files/1/0427/7341/4055/files/91316460280.pdf
    • https://cdn.shopify.com/s/files/1/0432/1722/3840/files/xikolub.pdf
    • https://cdn.shopify.com/s/files/1/0440/9350/5688/files/ronagoluvumegigadev.pdf
    • https://cdn.shopify.com/s/files/1/0433/2499/7800/files/85531417636.pdf
    • https://cdn.shopify.com/s/files/1/0433/9240/1573/files/1273633397.pdf
    • https://cdn.shopify.com/s/files/1/0430/5436/6877/files/gezufagemojalidoxesut.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/giratajolexodomofavewolov.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007c58.bin
3f60e1d884a31995cafa37a633f0ac85deed3431b242fff6b2c8e888340640f2
pdf-font-stream PDF embedded font (sfnt) at offset 0x7C58 5532 bytes
font_01_sfnt_off00008f3b.bin
c71155fcf68fe3bf7241bc15559bf4c5eeb75d6b6ad4a27a1d502ec5e3d2a999
pdf-font-stream PDF embedded font (sfnt) at offset 0x8F3B 10252 bytes